Thread Rolling Fasteners

Transcription

1 Thread Rolling Fasteners

2 TAPTITE PRO Fasteners Parabola #1 Parabolic Profile Parabola #2 TAPTITE PRO thread forming fasteners, the next evolution of TAPTITE fasteners, advances current thread forming technology with the development of the Parabolic Profile thread form. The innovative new thread form, when combined with the proven TRILOBULAR cross section, provides low thread forming torque, excellent resistance to vibrational loosening along with high axial pull-out, and reduced overall cost of assembly. In addition to these great benefits, TAPTITE PRO fasteners maintain torque tension relationships comparable to machine screws of equivalent size, as well as an improved failure mode, as a result of overtightening, in standard lengths of engagement; the screw will fracture within the screw threads. This preferred failure mode greatly reduces the risk of costly assembly line repairs and scrap due to stripped nut members or castings, along with the associated waste due to line downtime. This is an important design improvement that is effective in both steel and soft white metal applications ensuring a continued savings on the Big 85 TM in a wide range of your current and future fastened joints. ADVANTAGES OF USING TAPTITE PRO TECHNOLOGY Preferable Failure Mode - when the screw is overtightened, in standard lengths of engagement, the screw will fracture within the screw threads Eases Assembly - low end load to initiate thread forming, less operator fatigue Low Thread Forming Torque - increased out of round point threads Speeds up Assembly - no assembly line crossthreading Superior Vibration Resistance - eliminates need for add-on locking devices High Prevailing Torque - provided by the TRILOBULAR shape Deep Thread Engagements - generates strong mating threads with uninterrupted grain flow High Axial Pull-Out Loads - similar to that achieved using machine screws and bolts Various Metals & Hole Types - works in punched, drilled, cored and extruded holes No Secondary Clean-Up - forms threads in nut members contaminated with paint, primer or weld splatter Support - provided by REMINC/CONTI and fastener supplier personnel worldwide Availability - procurement available around the world Quality - official fasteners manufactured to strict standards 2

3 TAPTITE PRO Fasteners TAPTITE PRO DESIGNS TAPTITE PRO bolts M6 (¼-20) & above TAPTITE PRO screws M5 (12-24) & below TAPTITE PRO CA screws & bolts Rapid Hole Finding, Floating Nut Members & Difficult to Access Applications TAPTITE PRO SP screws & bolts For Use in Aluminum & Zinc Die Castings 3

4 TAPTITE PRO Fasteners - Cost Savings TAPTITE PRO Fasteners Reduce the Cost of Assembly When installing a simple screw, most of the assembly cost is composed of preparing the hole, tapping, cleaning, applying locking compound, driving the screw, operator cost, etc. All of these elements make up what we term the Big 85. The actual fastener makes up only 15% of assembly costs. A fastener, which reduces the Big 85, will lower assembly costs far more effectively than buying a cheaper fastener. The TAPTITE thread rolling screw family has been reducing the Big 85 in automotive, white goods, lawn equipment and electronics for decades. From a history of use beginning with the 1964 Ford Mustang to the latest cell phone, one major idea has been constant with TAPTITE products - In-Place Cost Savings. TAPTITE PRO screws eliminate the costs of tapping, washers and locking compounds or even the use of a nut. To find out how TAPTITE PRO thread rolling screws can save on your assembly costs, contact our application engineers or any of our highly-qualified licensed manufacturers listed on Standard Fastener Installation Components Labor Overhead Preparation of assembly Drilling and tapping the hole Application of locking device or adhesive Driving and tightening the screw THESE COSTS MAKE UP THE BIG 85 85% 15% Additional Costs M4 Clinching Nut Drill Pilot Hole Nut Lock Washer Washer Assembly COST REDUCTION Metric Fastener Additional Costs Drill Pilot Hole TAPTITE PRO Fastener 4

5 TAPTITE PRO Fasteners - Cost Savings Joint Costs: Lighting Appliance 3 fastening elements 1 fastening element 2 assembly directions 1 assembly direction Manual assembly (complex) Automated assembly 2 assembly processes 1 assembly process Standard Screw ($/100) TAPTITE PRO ($/100) Screw M4 x Clinching Process 9.07 Drill/Punch Pilot Hole Clinch Nut Lock Washer 0.87 Washer Assembly 3.64 Total: SAVINGS 61% 5

6 TAPTITE PRO Fasteners - 54 Ways TAPTITE PRO FASTENERS Here is a partial list of the ways TAPTITE PRO screws save on tapping costs. TAPTITE PRO screws eliminate tapping. You save all of these avoidable costs common to assemblies where holes must be tapped for machine screws. Check Check list of TAPTITE PRO screw savings and advantages Estimated Savings Below Per M Fasteners The elimination of tapping saves the cost of: Direct labor... $ Indirect labor... Taps... Jigs and fixtures... Tapping lubricants... Gauges... Setup time of tapping equipment... Downtime on automated equipment due to tapping station malfunction... Downtime to replace broken or malfunctioning taps... Low machine efficiency due to loading, galling and binding of taps in gummy materials Cleaning away oil and chips... Inspection for class of fit in tapped holes... Loss or repair of tapped assemblies due to undersize or oversize tapped threads... Loss or repair of tapped assemblies due to tap breakage or malfunction... Moving, storage and scheduling of parts to and from the tapping department... The elimination of tapping avoids these costly problems: Cross threading of machine screws into pretapped holes... Installing machine screws into tapped holes clogged with paint or other foreign material The need to maintain class of fit on assembled pieces... The need to distort heads or threads to secure screw against looseness... The need for locking type nylon inserts and collars... The need for lock nuts and lockwashers... The elimination of tapping makes possible: Use of punched or cored holes - eliminates drilling... Use of drilling and tapping stations for other needed operations on multi-operation, automated equipment... Release of tapping machinery for other tapping requirements - thus avoiding capital expenditure for additional tapping equipment... Threading directly into untapped, less expensive, tubular rivets and inserts... Use in less expensive plain unthreaded weld nuts... Use of punch-extruded holes - eliminates staked weld and clinch nuts... To see a full list of the 54 Ways TAPTITE PRO screws lower the In-Place Cost of Fastening go to See how many ways TAPTITE PRO screws can reduce The Big 85 on your assemblies. 6

7 Typical TAPTITE Product Applications APPLICATION: Hatch Back Strut FASTENER: PROBLEM: BENEFIT: M6 TAPTITE bolt with shoulder Limited access prevented repair nut replacement Eliminated need for nut & consequential repair costs Reduced fastener costs APPLICATION: Mounting Amplifier to Carrier Frame FASTENER: PROBLEM: BENEFIT: TAPTITE screw w/ captive isolation washer Vibrational loosening Excellent fastening values & high process capability Assembly complete & ready-to-fit Reduced materials management system costs APPLICATION: Seat Belt Bolts, Front and Shoulder Harness FASTENER: PROBLEM: BENEFIT: M12 x 35mm TAPTITE screws Cross threading during assembly Eliminates tapping operation Eliminates cross threading and scrap/rework APPLICATION: FASTENER: PROBLEM: BENEFIT: TAPTITE Screws Used to Assemble Aluminum Power Transfer Unit M8 x 1.25 x 35 hex flange head TAPTITE screws Expensive secondary tapping operation Elimination of all tapping associated costs Reduction in capital equipment 7

8 TAPTITE PRO Fasteners For M5 & #12 or Smaller For M6 & 1/4 or Larger SCREW BODY DIMENSIONS SCREW SIZE C D Max Min Max Min Metric Sizes (mm) M1.0 x M1.2 x M1.4 x M1.6 x M1.8 x M2.0 x M2.2 x M2.5 x M3.0 x M3.5 x M4.0 x M4.5 x M5.0 x M6.0 x M7.0 x M8.0 x M9.0 x M10 x M12 x M14 x M16 x M18 x M20 x SCREW BODY DIMENSIONS SCREW C D SIZE Max Min Max Min Inch Sizes (in) / / / / / / / / Stabilizing threads provide excellent axial alignment. (sizes M6 and larger) 8

9 TAPTITE PRO SP Fasteners The TAPTITE PRO SP fastener is well suited for use in blind holes in white metal applications. The TAPTITE PRO fastener has a shorter than standard point (2-2½ threads). TAPTITE PRO fasteners, maximize full thread engagement in shallow blind holes in die castings, which is often critical in shallow depth holes. This feature along with the TAPTITE PRO Parabolic Profile thread form allows the end user to eliminate excess assembly costs, and expensive secondary operations while still maintaining strength, torque-tension relationships and the preferable failure mode of an equivalent machine screw - see page 14 for hole sizing information. TAPTITE PRO SP fasteners are used in white metals and therefore are supplied with CORFLEX -ʽN heat treatment to minimize the potential of stress corrosion - see page 19 for more details. SCREW BODY DIMENSIONS SCREW BODY DIMENSIONS SCREW C D SCREW C D SIZE SIZE Max Min Max Min Max Min Max Min Metric Sizes (mm) Inch Sizes (in) M1.0 x M1.2 x M1.4 x M1.6 x M1.8 x M2.0 x M2.2 x M2.5 x M3.0 x M3.5 x M4.0 x / M4.5 x / M5.0 x / M6.0 x / M7.0 x / M8.0 x / M9.0 x / M10 x / M12 x M14 x NOTE: SP designates Short Point M16 x M18 x M20 x

10 TAPTITE PRO CA Fasteners The CA point can be supplied with a sharp point or a slightly truncated blunt point - which is desirable for situations when the sharp point could be a potential hazard to wires, components or assembly line and service personnel. CA Point Hole-Finding Capability TAPTITE PRO CA fasteners have a gimlet point for use when clearance holes and pilot holes do not align. The CA point is ideal for rapid hole finding, floating nut members or difficult access applications. TAPTITE PRO CA fasteners can be produced with any of our heat treatment processes; case hardened - our standard heat treatment for sizes M5 (#12) or smaller, CORFLEX - I induction hardened for structural or demanding applications or CORFLEX - N, neutral hardened non-ferrous applications. See page 19 for a more detailed description of the available heat treat options. 10

11 TAPTITE PRO Fasteners - Pilot Holes Recommended Pilot Hole Sizes for TAPTITE PRO Screws and Bolts at Various Percentages of Thread Engagement Metric Sizes (mm) SCREW SIZE PERCENT THREAD PILOT HOLE SIZES M1.2 x M1.4 x M1.6 x M1.8 x M2 x M2.5 x M3 x M3.5 x M4 x M5 x M6 x M7 x M8 x M10 x M12 x M14 x M16 x Inch Sizes (in) SCREW SIZE PERCENT THREAD PILOT HOLE SIZES / / / / / / EXAMPLE - Pilot Hole Tolerance: Minimum diameter hole = nominal hole thread percentage + 10%, maximum hole = nominal thread percentage - 5% Example: For M5-0.8 Size: The blue shaded area indicates a nominal hole diameter of 4.64mm, which yields 70% thread engagement. Minimum diameter hole = 70% + 10% = 80% engagement. A 80% hole for the M5-0.8 size = 4.58mm. Maximum diameter hole = 70% - 5% = 65% engagement. A 65% hole for the M5-0.8 size = 4.66mm. NOTES: All data tables in this brochure are for guidance purposes only. Because thread percentage values are based on a linear relationship, the percentages are less accurate for engagements less than 70%. 11

12 TAPTITE PRO Fasteners - Steel Recommended Pilot Hole Sizes for TAPTITE PRO Screws and Bolts in Steel Metric Sizes (mm) Application Light Medium-Light Medium-Heavy Full Strength Extended Duty 0.3 Diameter 0.5 Diameter 0.75 Diameter 1.0 Diameter 1.25 Diameter Class of Material of Material of Material of Material of Material Thread % 90% 80% 70% 65% 60% Nominal Material Hole Material Hole Material Hole Material Hole Material Hole Size Thickness Size Thickness Size Thickness Size Thickness Size Thickness Size M2.5 x M3 x M3.5 x M4 x M5 x M6 x M7 x M8 x M10 x M12 x M14 x Inch Sizes (in) / / Hole Tolerances for all Thread % APPLICATION DUTY CLASS - A general term used here to group material thickness in terms of screw diameters. For example, the average material thickness listed under medium-heavy equals 75% of the screw diameter which equates to 70% thread engagement. See Page 11 for hole tolerance explanation. 12

13 TAPTITE PRO Fasteners - Light-Gauge Steel Recommended Extruded Pilot Hole Sizes for TAPTITE PRO Screws and Bolts in Light-Gauge Steel H W, Typ x T D T R = 0.1 x T (.013mm/.005" Min.) Extruding holes for fasteners in light-gauge steel nearly doubles the length of thread engagement over the original material thickness. TAPTITE PRO screws and bolts develop almost twice the failure torque in extruded holes, providing maximum joint integrity. Metric Sizes (mm) Very Light Light Medium-Light Medium Application Approx x Approx x Approx x Approx x Nom. Dia. Nom. Dia. Nom. Dia. Nom. Dia. Nominal Material Hole H Material Hole H Material Hole H Material Hole H Size Thickness Size Ref. Thickness Size Ref. Thickness Size Ref. Thickness Size Ref. M M M M M M M M M M Hole Tolerances for all Thread % Inch Sizes (in) / /

14 TAPTITE PRO SP Fasteners - Pilot Holes Recommended Pilot Hole Sizes for Aluminum or Zinc Alloy Die Castings for TAPTITE PRO SP Fasteners Screw Size ØF Hole Dia. Drilled Hole Diameter as Cast The above table is based upon the recommended length of engagement of 2x, which allows for maximum screw strength. Depending upon casting material, screw hardness and screw strength requirements, different depths of engagement, both deeper and shallower, may be used. Please visit our website (taptite.com) to use our aluminum hole calculator. Engagement Length ØH Boss Dia. Top ØA Bottom ØB Lf - Full Ld - With Max. Min. Max. Min. Thread Point Min. Metric Sizes (mm) M2 x M2.5 x M3 x M3.5 x M4 x M5 x M6 x M8 x M10 x M12 x Inch Sizes (in) / / / / ØH ØH ØF C'Sink Depth ØA C'Sink Depth C'Sink Depth 1.1 Hole Depth (Draft Angle) Ld ØB Hole Depth Lf Ld Hole Depth Drilled Hole Cored Hole TAPTITE PRO SP Screw Fit *For Drilled hole tolerances see example on page 11 * For sizes not in table, contact Engineering 14 Screw Clearance

15 TAPTITE PRO Fasteners - Torque Performance The thread body lobulation and Parabolic Profile thread design of TAPTITE PRO fasteners provide torque-tension relationships similar to those that are achieved using machine screws Torque (Nm) Tension (kn) M Machine Screw in Threaded Steel Weld Nut Typical Assembly Torque Range Rotation - Degrees Torque (Nm) Tension (kn) M TAPTITE Pro Fastener in Unthreaded Steel Weld Nut High Failure Torque Typical Assembly Torque Range Thread-Forming Tq. Prevailing On Tq Rotation - Degrees 15

16 TAPTITE PRO Fasteners - Torque Performance Inch Sizes (lb-in) Screw Size Plate Thickness Hole Size Nearest Drill Size Thread Forming Torque Recommended Assembly Torque Failure Torque /4-20 5/ /8-16 7/ / mm # # mm # # # mm mm # # # # # / # mm mm / / / # # # # # / mm mm # K mm mm S S mm Y / / / / / Note: See Page 17 for applicable notes. 16

17 TAPTITE PRO Fasteners - Torque Performance Metric Sizes (Nm) Screw Size Plate Thickness Hole Size Nearest Drill Size Thread Forming Torque Recommended Assembly Torque Failure Torque M3 x 0.5 M4 x 0.7 M5 x 0.8 M6 x 1.0 M8 x 1.25 M10 x 1.5 M12 x # / / # # # mm mm / mm L M mm mm U Notes: 1. Failure mode is comparable to that of an equivalent machine screw. 2. Performance was developed using Hex Flange head screws, zinc plated plus wax, driven at low speed under laboratory conditions into cold rolled steel test plates with plain flat steel washers under screw head to absorb tightening. 3. Values shown represent the above conditions only and should not be used in lieu of proper application testing. Having a thicker/thinner nut member, harder/softer material, different hole, can all contribute to variations in torque performance. 17

18 TAPTITE PRO Fasteners - Vibrational Resistance TAPTITE PRO fasteners demonstrate excellent resistance to vibrational loosening, as illustrated by the chart below JUNKERS TRANSVERSE VIBRATION TEST RESULTS TAPTITE Pro Screw vs. Machine Screw Both Screws Seated to Same Initial Clamp Load Clamp Load (Tension) Embedment as Test Starts Average Retained Clamp Load of 54% TAPTITE Pro Fastener 2.0 Average Retained Clamp Load of 4% Machine Screw Time M6-1.0 TAPTITE PRO Fasteners & Machine Screws Retained Clamp Load After 60 Seconds In Aluminum Vibration Test Nuts 12.0 Torque (Nm) or Tension (kn) Nm 8.0 Nm 10.2 kn 10.3 kn 5.5 kn 0.4 kn 0.0 Tq. to Achieve Aim Clamp Load Avg (Nm) Seating Clamp Load Avg (kn) Retained Clamp Load After Vibration Test - Avg (kn) TAPTITE PRO Fastener Machine Screw 18

19 TAPTITE PRO Fasteners - Heat Treatment FASTENER HEAT TREATMENT TAPTITE PRO screws and bolts are available with three different types of heat treatment, making the fasteners adaptable to a wider variety of applications. CORFLEX - I Heat Treatment CORFLEX - I TAPTITE PRO bolts are neutral hardened to grade strength, metric 8.8, 9.8, 10.9 or any intermediate value. The thread forming zone is selectively induction hardened in order to form threads in steel untapped nuts. CORFLEX - I heat treatment allows TAPTITE PRO thread rolling bolts to provide in-place cost savings in large structural applications with strength, ductility and toughness equal to grade strength machine screws or bolts. CORFLEX - N Heat Treatment CORFLEX - N TAPTITE PRO fasteners are neutral hardened to grade 8.8, 9.8, and 10.9 strength level. Designed to be used in soft white metals such as aluminum or zinc alloys. Can be specified for any size TAPTITE PRO screws or bolts intended to be used in aluminum or zinc alloys. Case Hardening Standard heat treatment for TAPTITE PRO screws in sizes M5 (#12) and smaller. SUCCESSFUL THREAD FORMING BASIC PRINCIPLE A thread rolling or thread forming screw must be harder than the nut material being thread formed to withstand the pressure that occurs when forming the nut material. HEAT TAILORED FOR EXTRA TOUGHNESS The pin-point precision of the high hardness, or induction zone is shown as the darkened portion of the picture on the left, a chemically etched and mounted axial section of a CORFLEX - I fastener. 19

20 REMINC/CONTI Research Engineering & Manufacturing Inc. (REMINC) and Conti Fasteners AG (CONTI) have successfully marketed TAPTITE fastener technology internationally since Their success has been accomplished by licensing and training leading fastener producers worldwide. The technical program in the United States is under the direction of REMINC, located in Middletown, Rhode Island and in other countries under the direction of CONTI, situated in Baar, Switzerland. Although REMINC and CONTI are separate corporations and operate independently, each is dependent on the other for certain functional activities. AVAILABILITY Currently there are over 103 authorized suppliers located in more than 27 countries utilizing the Technical Know-How, Patents, Trademarks, and Engineering and Marketing services of REMINC/CONTI. These producers delivered a volume in excess of 17,000,000,000 pieces of TRILOBULAR fasteners in 2017, comprising a mix of products. The proprietary products available in the program are marketed and sold, not as fastener items, but rather as COST REDUCTIONS TO END-USERS OF ASSEMBLED PRODUCTS. The proprietary fasteners offered to the assemblers are the means to an end, i.e. used to generate cost reductions while at the same time providing reliably tightened joints. SERVICES Capabilities of REMINC/CONTI in support of manufacturers: ORDERING/SUPPLY When ordering from authorized TRILOBULAR fastener producers, be sure in all cases to specify the TAPTITE PRO brand name, thread size, nominal length, head and point style, strength grade if CORFLEX -ʽN or CORFLEX -ʽI is involved, and any other special features required, finish and quantity. DISCLAIMER CLAUSE The values shown in this brochure are for guidance only. They are not meant to be used for design criteria. Their use and reliance thereon for any purpose by anyone is entirely voluntary and at the sole risk of the user. REMINC/CONTI are not responsible for any loss, claim, or damage resulting from their use. Consult our application engineers or the application engineering department of one of our many qualified producers for your specific application data. TECHNICAL ASSISTANCE To obtain further assistance and a list of authorized producers, visit our website at or contact REMINC in North America or CONTI in all other countries. Technical Support New Product Development Research/Development Reports Technical Manuals Technical Reports Engineering Consultation Computer Aided Design/Analysis Engineering Training Marketing Support Application Definition Application Reports Performance Documentation Sales Seminars Audio/Video Materials Graphics Additional Services Available Consultation Engineering and Testing Fastener Engineering Training Tooling Design/Procurement Manufacturing Guidance Manufacturing Cost Reduction Metallurgical Analysis End-User Application Guidance Technical Training Seminars Customer Product Brochures Technical Liaison Joint Customer Visits Cooperative Studies Trademark and Patent Use Research Engineering & Manufacturing Inc. 55 Hammarlund Way, Tech II, Middletown, RI USA Tel: Fax: reminc@reminc.net CONTI Fasteners AG Albisstrasse 15, 6340 Baar (ZG) Switzerland Tel: +41 (0)41/ Fax: +41 (0)41/ conti@contifasteners.ch TAPTITE PRO, TRILOBULAR, CORFLEX, CORFLEX -ʽI, CORFLEX -ʽN are trademarks licensed by REMINC/CONTI. COPYRIGHT 2018 by RESEARCH ENGINEERING & MANUFACTURING INC. May 2018